JP2006070424A - Yarn quality assurance method and yarn processing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a yarn quality assurance method on the production of a multifilament yarn, and to provide a yarn-processing machine set up for implementing the method. <P>SOLUTION: This yarn-processing machine comprises at least one feeding spool receiver 24, 30 set up to receive respectively at least one feeding spool 20, 29 from which yarns can be taken off, and a multifilament yarn manufacturing unit 5 to which yarns are supplied from the feeding spools 20, 29 via thread runs with respectively one thread tension. A thread tension regulating module 25 with a thread tension sensor is arranged in at least one controlled thread run 1 between the relevant feeding spool receiver 24 and the multifilament yarn manufacturing unit 5, wherein the thread tension regulating module 25 is set up to derive a control value from a thread tension measured by the thread tension sensor and to keep the thread tension constant in a predetermined thread tension range. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a yarn quality assurance method for producing a multifilament yarn and a yarn processing machine that executes the yarn quality assurance method. The yarn quality assurance method includes a process step of unwinding at least one yarn from each yarn winding and feeding the yarn to a multifilament yarn manufacturing apparatus via a run of thread. In the device, the thread is kept at a certain tension. This yarn quality assurance method is suitable in principle for use in any multifilament yarn production method, for example the draw winding method or the weaving method, but is particularly suitable for the texturing method, in particular the false twisting method and / or the air covering method.

  A machine with an air covering nozzle (air covering machine) is a multi-component yarn (air covering thread) that is processed by an air jet (interlace jet) so that a plurality of filament yarns cannot be removed from each other. )) Is used to manufacture. In this case, at least one covering yarn (decorating yarn) is coupled to the core yarn as a constituent material. The purpose of this process is to bind the components together by tying the knots as uniform as possible in the composite yarn, thereby giving the manufactured multifilament yarn good mechanical and structural elasticity. It is in. An example of an air covering yarn is disclosed in Patent Document 1. The core yarn is usually made of an elastomer-containing highly elastic yarn such as Lycra (registered trademark). The covering yarn can consist of various decorative yarns. Yarns, that is, decorative yarns and core yarns, are fed to an air covering nozzle through a yarn feeding roll, for example, a godet roll. After the composite yarn passes through the air covering nozzle, the composite yarn is wound around the spool and wound around the spool.

  In this case, the elastic yarn is unwinded in the normal direction and unwinded from the yarn supply winding using a special yarn supply roll (unwinding in the folding direction). In order to perform this operation, at least one additional drive is required. In order to unwind the yarn winding of the elastic yarn in the fold line direction, the thread winding is arranged so that its axis is parallel to the axis of the yarn feeding roll used for unwinding. When the yarn winding is emptied, all manufacturing processes must be stopped to make the yarn winding replaceable. When it is necessary to replace the yarn spool, for example, when the current yarn spool is used up, there is a complex system that automatically replaces the yarn spool just to interrupt the manufacturing process as quickly as possible. Has been developed. Such a system is disclosed in Patent Document 2, for example. There are differences between the two examples for feeding in the polygonal line direction. In the free rotation folding line feeding, the yarn winding does not have a drive source and is placed on the free rotation pipe. Free rotation payout can only be used at low production speeds. In the driven broken line direction feeding, the yarn winding is rotationally driven via a support shaft. This driven bent line direction feed can be used at a high production speed using elastic yarn.

  The covering yarn can be manufactured using, for example, a known yarn processing machine that processes filament yarn with an air textured nozzle (air textured machine). For example, the production and processing of a covering yarn using an air textured nozzle is usually performed by a single machine. Such an air textured machine is disclosed in Patent Document 3. The air textured machine is used to shrink the unstructured smooth filament yarn so that it cannot be removed. In this case, in order to form a textured yarn, a plurality of yarn supply yarns are processed together with different decorative yarns. In this processing, the filament yarn is shrunk unevenly and is arranged around the yarn supply yarn if necessary. The covering yarn may consist of various decorative yarns. Filament yarns, i.e. covering yarns and core yarns, are fed to an air textured nozzle via a yarn feed roll, e.g. a godet roll. After these yarns pass through the air-textured nozzle, the decorative yarn (composite yarn), which is a product made up of a plurality of constituent materials, is fed out from the spool around which the composite yarn is wound. Prior to winding, the composite yarn can be re-stretched, secured, shrunk, and / or finished.

  It is further known to produce covering yarn using a yarn processing machine that performs false twisting. This method is known as torsion crimping. In this case, the filament yarn is given a so-called false twist by two pairs of cylinders, specifically false twist spindles between the yarn feeding roll and the unwinding roll, and this false twist is obtained by heating the filament yarn. It is fixed to a capillary thread using thermoplastic properties. After cooling, the decorative twist, which is a product, shrinks due to the influence of the latent twisting force.

  For this purpose, the multifilament yarn is usually unwound from the spool, passed through the first yarn feed roll, heated in the heater (first heater), cooled on the cooling rail, and finally wound on the spool. Before passing, a false twisting spindle, a second yarn feeding roll arranged in the subsequent stage, and a so-called feeding yarn feeding roll are passed. False twisting spindles are used to temporarily strongly twist multifilament yarns in one work process, namely twisting multifilament yarns or individual filament yarns by transmitting axial torque to the filament yarns. This temporary twist (twisted state) is called false twist (FD). As a result of twisting, a rotational return pressure is formed, which spreads to the heater (twisting zone), thereby thermally fixing the twisted state of the filament yarn by heating and cooling before passing through the false twisting spindle. can do. After passing through the false twist spindle, the twist is unwound again. As a result of heat setting performed in the twisted state, the yarn has the desired crimped structure.

  By using a friction false twist spindle as the false twist spindle, a very high production rate can be achieved. In these false twist spindles, the filament yarn is indirectly driven by the friction surface. As a result of the small diameter of the thread compared to the spindle, i.e. the disk of the disk friction device, a high speed transmission ratio is realized, for example, between the rotation of the disk and the twist of the filament thread. A triaxial disc friction device is particularly suitable for this purpose. Therefore, an excellent friction false twist spindle, in particular a triaxial disc friction device and a so-called nip twister which transmits the rotational force to the filament yarn by means of a cross belt is used as false twist spindle. Such a disc friction device is disclosed in Patent Document 4, for example. A nip twister is disclosed in Patent Document 5. A very high rotational speed can be achieved by applying a twist by friction, and thus a high production speed can be achieved. If the frictional relationship between the filament yarn and false twisting spindle changes, i.e. when machining fluctuations or unstable machining occurs, a non-uniform yarn structure occurs or the yarn is defective and manufactured This leads to a decrease in yarn quality. Such defects or disturbances are, for example, disturbances in the spinning mill, uneven application or uneven adjustment of the yarn surface pre-spinning treatment, temperature fluctuations during texturing, or, for example, heaters and / or Due to contamination in the cooling rail. These disturbances cause so-called yarn ballooning which occurs especially at high rotational speeds and the high yarn tension associated therewith. Yarn ballooning causes uncontrollable yarn paths and variations in yarn tension. As a result, the yarn can jump over the disk surface of the false twist spindle, for example. This twist misalignment leads to insufficient twist in the twisted area, that is, variation in twist density, which is the number of twists per unit length of the filament yarn. The processed yarn can therefore pass through the false twist spindle without being twisted in cross section. This produces short adjacent yarn portions, so-called “narrow portions”, and non-uniformly textured long yarn portions called surging. In surging, the yarn tension suddenly increases, which breaks the balance of force on the false twist spindle. An untwisted area is formed in the yarn. Furthermore, the amount of extension varies and dyeing becomes unsatisfactory.

  Textured processing speeds exceeding 300 m / min can be achieved with a friction false twist spindle. The lengths of the heating and cooling zones in the textured zone are adapted to the texturing speed in order to provide sufficient heat setting of the crimp. If the length of the entire textured area is 5 to 6 m, the surging phenomenon occurs particularly frequently in connection with friction false twist spindles that operate by force locking. With the force-fixed false twist spindle according to the prior art, the twist density produced cannot be controlled exactly exactly, which results in a processing limit of surging processing technology and therefore with associated yarn tension variations. Ballooning of the yarn in the twist area likewise causes twist fluctuations. The stability limit of processing is on the one hand the geometric dimensions of the textured area, for example its length, deflection point, yarn support, etc., on the other hand, the quality of the feed material, for example its uniformity, pretreatment, i.e. generation. Affected by machining fluctuations.

  Another factor limiting the production rate in false twisting is the unwinding speed from the yarn winding of a yarn, for example, a non-uniformly oriented multifilament yarn (POY). A higher unwinding speed causes a drastic change in the yarn tension in the yarn path region after the yarn feeding (winding region). This arises from the properties of the known “balloon” formed by the yarn during unwinding.

  False twisting always involves unwinding the POY yarn from the yarn winding. The yarn is fed out from the yarn winding by the rotational movement of the feeding roll (yarn feeding roll). The payout roll usually has a main roll driven by a motor and a passive separation roll that defines the geometry of the winding of the yarn around the main roll. In order to avoid a change in yarn tension in the unwinding region, it is known to apply a pressing force to the main roll by a nip roller which is another roller. The yarn is thereby sandwiched between the main roll and the other rollers, and the yarn is fed to the textured process at the tangential speed of the main roll. Various pretensioning systems are also known which are arranged between a yarn winding and a yarn feeding roll that increase and stabilize the yarn tension during unwinding from the yarn winding.

For example, fluctuations in the tension of the POY yarn fed out from the yarn winding have essentially the following causes. That is,
-As the yarn winding diameter decreases as time passes as a result of yarn unwinding, the geometrical dimensions of the "balloon" formed by the movement of the yarn along the spool axis change accordingly. Affects the yarn tension.
-Increased production speed, thereby increasing the unwinding speed of the yarn from the yarn winding, increasing the centrifugal force acting on the yarn in the "balloon" and increasing the yarn tension. These problems occur particularly significantly in polyamide (PA) yarns.

  In known devices for avoiding fluctuations in yarn tension during texturing, the yarn tension of the yarn can be adjusted only before the start of the production process. This is not sufficient to avoid the change in yarn tension during the manufacturing process described above.

  U.S. Pat. No. 6,057,051 discloses an apparatus and method for texturing a thread being fed. The tension of the yarn entering the textured nozzle is detected, and the twisting effect in the textured nozzle is controlled according to the tension.

It is further known from US Pat. No. 6,057,089 to measure and adjust the yarn tension of individual yarns in a yarn adjustment method relating to winding processes, for example yarn oiling, dyeing or stretching. In this case, the yarn tension of the yarn is measured in the yarn path after passing through the adjustment device, and the adjusted yarn tension is derived from the measured tension before winding, ie at the end of the adjustment process. According to the adjusted value, the yarn tension regulating module keeps the tension constant within a predetermined range. The yarn tension regulating module includes a brake and a controllable yarn feeding roll, and these are used to regulate the yarn tension by decreasing and / or increasing the yarn speed of the yarn.
US Pat. No. 6,405,519 International Publication No. 2004/035446 Pamphlet German Patent Application No. 3909516 German Patent Application Publication No. 3743708 Japanese Patent Laid-Open No. 06-184848 Swiss Patent Application No. 691386 European Patent Application No. 0875479

  An object of the present invention is to provide a yarn quality assurance method that can avoid the drawbacks of the prior art, and in particular, can achieve a high production speed while minimizing downtime of the yarn processing machine.

  This object is solved by the yarn quality assurance method and yarn processing machine according to each independent claim. The dependent claims represent preferred embodiments of the invention.

The yarn quality assurance method according to the present invention for the production of multifilament yarns is:
Unwinding at least one yarn from each one yarn winding;
A multi-filament yarn manufacturing apparatus that maintains the yarn at a certain tension, and a process step of feeding the yarn through each yarn path.

  According to the present invention, at least the yarn tension of the control yarn is measured in the yarn path between the yarn supply yarn winding of the yarn and the multifilament yarn production device, and before being fed to the multifilament yarn production device. The yarn tension of the control yarn is kept constant in a predetermined tension range by the yarn tension defining module according to the adjustment value derived from the measured yarn tension.

  The yarn tension regulating module can be configured in accordance with, for example, the device disclosed in Patent Document 7 described above. Importantly, the yarn tension defining module has an active adjustable drive that allows the yarn tension to be defined. The yarn tension can be measured by using, for example, a yarn tension sensor composed of a strain gauge. However, the yarn tension sensor can also measure and monitor the power consumption of the drive. Since the friction value between the yarn and the drive unit is affected by the yarn tension, the power consumption of the drive unit varies depending on the yarn tension, and the control value can be determined from the yarn tension. Any type of yarn tension regulating system, for example a standard yarn feeding roll combined with a measuring device for measuring the current flowing through the yarn feeding roll in addition to a circuit for evaluating the measured current, is used as the yarn tension regulating system Can do. In this arrangement, the yarn supply roll itself functions as a yarn tension sensor.

  According to the method of the present invention, the yarn tension in the unwinding region is stable, and the normal yarn tension profile is maintained over a long period of time regardless of the production speed and the diameter of the yarn feeding yarn winding. This ensures that the product multifilament yarn, for example, the textured yarn over the entire length of the POY yarn in the yarn winding, has a uniform quality. Furthermore, an increase in production speed of the manufacturing process is achieved under the condition that the yarn quality is the same.

  The method according to the invention makes it possible to achieve complete “on-line” control of the yarn tension during unwinding from the yarn winding. Yarn tension can be kept constant regardless of yarn quality, yarn winding diameter, or selected unwinding speed. In addition, if necessary, the yarn tension during winding can be increased or decreased by a controlled method, as well as the yarn tension can be permanently reduced, thereby increasing the production speed. And efficiency can be realized.

  The controlled yarn is advantageously fed in particular by a multifilament yarn production device, preferably first fed to the heater via a feed roll, then fed to the cooler and then air texture. And the yarn is fed to a twisting device. Thus, the method according to the present invention is used for false twisting. When the method according to the invention is used in the false twisting process, most of the “surging” that typically occurs at high production rates can be avoided.

  The method according to the invention is particularly preferably used for high-elasticity yarns as control yarns, in which the high-elasticity yarns are preferably transmitted via a yarn feed roll and / or at least one yarn guide device. The yarn is fed to the air covering nozzle of the filament yarn manufacturing apparatus. In this case, the high elastic yarn is unwound upward.

  In the method according to the present invention, fluctuations in the generated yarn tension are canceled out, so that the elastic yarn can be fed upward. If the elastic yarn is fed upward in the air covering step, it is possible to avoid interruption of the manufacturing process due to changing the yarn feeding yarn winding. The yarn winding itself does not rotate during upward feeding, and can cooperate with the spare yarn winding that is immediately available during upward feeding, minimizing downtime of a properly operating yarn processing machine can do. The preliminary yarn winding is arranged symmetrically with respect to the vertical axis of the yarn processing machine having the yarn winding with which the elastic yarn is currently fed. The free end of the pre-feed yarn winding thread is tied to the end of the currently unwinding yarn winding thread. When the currently unwound yarn winding thread is used up, the pre-feed yarn winding is automatically unwound and the manufacturing process continues without interruption. The empty supply spool is then replaced with a new supply spool that is used as a new reserve yarn spool, and the new supply spool is tied to the old reserve yarn spool. Thereby, a process with almost no interruption is realized.

  The yarn speed of the control yarn is preferably reduced and / or increased by the yarn tension defining module. Yarn tension can be reduced and increased by lowering or increasing yarn speed. If the measured yarn tension is recorded, the quality of the product multifilament yarn can be continuously evaluated and investigated.

  The yarn processing machine according to the present invention includes at least one yarn winding spool container installed to store at least one yarn winding spool capable of feeding the yarn, and the yarn feeding yarn winding with one yarn tension each. And a multifilament yarn manufacturing apparatus that can be fed via a yarn path. According to the present invention, the yarn tension defining module comprises a yarn tension sensor disposed in at least one control yarn path between the associated yarn winding container and the multifilament yarn production device, preferably the yarn tension defining module. The module comprises a yarn brake and / or a controllable yarn feed roll. The yarn tension regulating module is installed to derive a control value from the yarn tension measured by the yarn tension sensor and to keep the yarn tension constant in a predetermined yarn tension range. The yarn quality assurance method according to the present invention can be executed using the yarn processing machine according to the present invention. Therefore, the yarn processing machine according to the present invention can exhibit the advantages of the yarn quality assurance method according to the present invention.

  In the yarn processing machine according to the present invention, the multifilament yarn manufacturing apparatus is preferably arranged in order in the yarn path, the yarn feeding roll, the heater and the cooler arranged downstream thereof, and the downstream thereof. An air textured nozzle, or preferably a false twist spindle. In this arrangement, the yarn processing machine is a textured processing machine, that is, a false twisting machine, or an air textured processing machine, and most of manufacturing defects resulting from fluctuations in yarn tension are eliminated.

  The multifilament yarn manufacturing apparatus preferably includes an air covering nozzle, and preferably, a yarn feeding roll and / or at least one yarn guide device is disposed in a yarn path in front of the air covering nozzle, and the yarn is fed in the control yarn path. A bobbin container is installed, and the high-elasticity yarn is fed upward from the bobbin spool housed in the yarn supply container. The yarn winding can be part of a yarn tension regulating module. The yarn guide device makes it possible to feed a highly elastic yarn from the same location of the yarn tension regulating module at all times. This is particularly advantageous during the upward unwinding of the elastic yarn from the yarn winding, since it is possible to avoid interruption of the production process due to the yarn winding in the upward winding by the preliminary yarn winding. The preliminary yarn winding can be held in advance by another yarn winding container.

  The present invention will be described in detail below in an exemplary embodiment with reference to the drawings.

  It should be understood that the figures in the drawings illustrate the subject matter of the present invention in a very schematic and not to scale. The individual components of the subject matter according to the invention are depicted in such a way that the structure can be clearly illustrated.

  FIG. 1 shows a control yarn path 1 in a yarn processing machine according to the present invention. By this yarn processing machine, an air covering method is executed using an elastic yarn and a yarn as a covering yarn manufactured in a false twisting device 3. The The method according to the present invention shall be shown for an example of a yarn processing machine for producing an air covering yarn by false twisting. However, the elastic yarn as the control yarn is fed to the air covering device 5 as the multifilament yarn manufacturing device via the method according to the present invention, and particularly through the actively driven feeder roll 7. The preferred embodiment relating to the yarn feeding and the upper unwinding of the elastic yarn used therefor can be equally used for the production of air-textured yarn, for example. The figure shows the possible arrangement of each element that can be included in the combination of the air covering process and the false twisting process. In the textured processing device, the textured yarn unwound from the yarn supply winding 8 through the yarn supply roll 9 passes through the heater 10, the cooler 11, and the twisting device 12. At the end of the textured processing device, The textured yarn is guided so as to surround the yarn feeding roll 13 before being carried into the air covering nozzle 5, and the air covering nozzle 5 connects the yarn to the elastic yarn. That is, in an air covering nozzle, the textured yarn is elasticized by a small knot to form a compact structure for subsequent procedures, i.e. for winding the finished multifilament yarn around the spool 15. It is connected to the thread. Before the yarn is wound around the spool 15, the finished multifilament yarn is guided through a yarn feeding roll 17 disposed between the air covering nozzle 5 and the spool 15 and a yarn guide device 18. The Then, the elastic yarn is fed upward from the yarn supply winding 20. In this case, the elastic yarn is first guided through the yarn guide device 22 and further guided through the live driven yarn supplying roll 7. These yarn feeding rolls 7 are part of the yarn tension regulating module 25. The yarn tension defining module 25 has a live adjustment driving unit installed to control and regulate the yarn tension. The yarn feeding roll 7 pulls the elastic yarn as a result of its driving, whereby the elastic yarn is fed upward from the yarn feeding winding 20. The elastic yarn necessary for ensuring the mechanical stability of the multifilament yarn as a product is the rotational speed of the yarn feeding roll 17 disposed between the air covering nozzle 5 and the yarn winding 15 and the active driven yarn feeding roll 7. Is adjusted through the differences. During the upward feeding, the yarn can be unwound from the outer periphery or the inner periphery of the yarn feeding yarn winding 20. The yarn winding 20 is always fixedly accommodated by a yarn feeding container 24. Since the yarn feeder 20 does not rotate during upward feeding, the one end 27 of the yarn of the yarn feeder 20 is the same as the yarn of another yarn feeder (preliminary yarn spool 29) held in the yarn feeder container 30. Thus, the preliminary yarn winding 29 can be automatically unwound after the yarn winding 20 is completely unwound. Thus, it is not necessary to interrupt the manufacturing process during upward feeding.

  The upward feeding from the outer circumference is in this case particularly suitable for the method according to the invention, since a particularly high speed can be achieved during unwinding of the yarn. During the upward feeding, a “balloon” 31 is formed, whereby the yarn tension changes continuously in the unwinding region. In the illustrated yarn processing machine, the yarn tension is defined by the yarn tension regulating module 25 between the yarn feeding container 24 and the air covering nozzle 5 so that the change in tension does not adversely affect the quality of the multifilament yarn to be manufactured. And it is kept constant within a certain tension range. In the illustrated example, the yarn tension regulating module 25 is arranged between the two yarn guide devices 22 and 32, one of which is arranged in front of the air covering nozzle 5. In the yarn guide device 32, the elastic yarn is coupled to the covering yarn that has been false twisted, and then supplied to the air covering nozzle 5 with a prescribed yarn tension, for example. The yarn guide device 22 in front of the yarn tension regulating module 25 is disposed at the center position in front of the live driven yarn feeding roll 7. The yarn guide device 22 has an effect that the elastic yarn is always fed from the same position to the active driven yarn feeding roll 7 regardless of which one of the yarn feeding yarn windings 20 and 29 is used. For this purpose, the yarn guide device 22 is located “in focus” between the two yarn windings 20, 29.

  FIG. 2 shows a control yarn path 40 in a yarn processing machine according to the present invention between a multifilament yarn production device embodied as a yarn supply container 41 and a false twist device 42. The false twisting device 42 includes a heater 43, a cooler 44, and a twisting device 45. A yarn is fed from a yarn winding 46 located in the yarn feeding container 41 to a false twisting device 42 via a yarn feeding roll 48. The yarn supply roll 48 includes a main roll 49 and a separation roll 50 around which a yarn is wound. As a result of the unwinding process, the yarn forms a “balloon” 31. The yarn tension regulating module 53 is disposed in the yarn path between the balloon 31 and the yarn feeding roll 48. The yarn tension regulating module 53 includes a yarn tension sensor 54 that measures the yarn tension, a yarn brake 55, and a controllable yarn feeding roll 56. A control value of the yarn tension is derived by the yarn tension defining module 53, whereby the yarn tension is kept constant in a predetermined range. The control value can be, for example, the difference between the measured yarn tension and the desired yarn tension. The yarn brake 55 and / or the controllable yarn feeding roll 56 are controlled according to the control value. For example, if the measured yarn tension is too high, the yarn speed is reduced by the yarn brake 55. If the yarn processing machine according to the present invention is used, the yarn tension that increases linearly with the increase in production speed in the conventional technique can be kept constant regardless of the production speed. Therefore, the yarn tension can be adjusted as required in the multifilament yarn manufacturing process ("downstream process"). The yarn tension is measured using the yarn tension sensor 54, and the rotational speed of the controllable yarn feeding roll 56 and / or the braking force of the yarn brake 55 is controlled in a closed control loop in accordance with the measured yarn tension. If the diameter of the yarn supply spool 46 decreases, the yarn tension defining module 53 via the control loop causes the yarn tension to correspond to a desired value during the entire manufacturing process, for example within a predetermined range of yarn tension. It is automatically changed so that it is kept constant. Therefore, the yarn tension regulating module 53 regulates the yarn tension. For example, the POY yarn is fed to the multifilament yarn production apparatus, for example, the false twisting apparatus 42 with a predetermined value of yarn tension that is unrelated to the increase in production speed. This removes one of the factors that limits the increase in production rate during false twisting.

  A yarn quality assurance method according to the present invention and a yarn processing machine installed to carry out the method are proposed, the yarn processing machine for accommodating each of at least one yarn winding 20, 29 capable of delivering the yarn. And a multifilament yarn manufacturing apparatus 5 for supplying yarns from the yarn supply yarn windings 20 and 29 via the yarn path with a single yarn tension, respectively. . According to the present invention, a yarn tension regulating module 25 having a yarn tension sensor is arranged in at least one control yarn path 1 between the related yarn supply container 24 and the multifilament yarn manufacturing apparatus 5, and the yarn tension regulating module is arranged. No. 25 is installed in order to derive a control value from the yarn tension measured by the yarn tension sensor and to keep the yarn tension constant within a predetermined yarn tension range.

  The present invention is not limited to the specific embodiments described above. On the contrary, there can be many variations that use the features of the present invention in types that are radically different in design.

It is a figure which shows the thread | yarn path | route in the yarn processing machine which concerns on this invention. It is a figure which shows the thread | yarn path | route between a yarn supply thread | yarn winding container and the multifilament yarn manufacturing apparatus used in order to perform a false twist method.

Explanation of symbols

1,40 Yarn path 5 Air covering device 7 Active driven yarn feeding roll 20, 46 Yarn winding device 22, 32 Yarn guide device 24, 30, 41 Yarn feeding device 25, 53 Yarn tension regulating module 29 Preliminary yarn winding 42 false twisting device 43 heater 44 cooler 45 twisting device 48 yarn feeding roll 54 yarn tension sensor 55 yarn brake 56 controllable yarn feeding roll

Claims (7)

A yarn quality assurance method for the production of multifilament yarns,
A process step of unwinding at least one yarn from each one yarn winding (20, 29, 46);
A multi-filament yarn manufacturing apparatus (42, 5) for keeping the yarn at a certain tension, and a process step of feeding the yarn through each yarn path (1, 40),
In a yarn quality assurance method for measuring at least a yarn tension of a control yarn in a yarn path between the yarn supply yarn winding (20, 46) and the multifilament yarn manufacturing device (42, 5),
Before the yarn is fed to the multifilament yarn production apparatus (42, 5), the yarn tension of the control yarn is determined according to an adjustment value derived from the measured yarn tension. The yarn quality assurance method is characterized in that the yarn is kept constant in a predetermined tension range.   The control filament is first fed to the heater (43) by the multifilament yarn production device (42), preferably via a yarn feed roll (48), and then to the cooler (44), and then A yarn quality assurance method according to claim 1, characterized in that the yarn is fed to an air textured nozzle or preferably a twisting device (45).   A highly elastic yarn as a control yarn is preferably fed to the air covering nozzle (5) of the multifilament yarn production device via a yarn feed roll (7) and / or at least one yarn guide device (22, 32). The yarn quality assurance method according to claim 1 or 2, wherein the high elastic yarn is fed upward.   The yarn speed of the control yarn is preferably lowered and / or raised by the yarn tension defining module (25, 53) and / or the measured yarn tension is recorded. 4. The yarn quality assurance method according to any one of items 1 to 3. A yarn processing machine installed to perform the method according to at least one of claims 1 to 4,
At least one yarn winding container (24, 30, 41) installed to receive at least one yarn winding (20, 29, 46) capable of delivering the yarn, respectively;
A multifilament yarn manufacturing device (5, 42) capable of supplying yarns from the yarn winding (20, 46) via a yarn path with a single yarn tension,
The yarn tension regulating module (25, 53) includes at least one control yarn path (1, 40) between the associated yarn winding container (24, 41) and the multifilament yarn production device (5, 42). In a yarn processing machine provided with a yarn tension sensor (54) arranged in
The yarn tension regulating module (25, 53) preferably comprises a yarn brake (55) and / or a controllable yarn feeding roll (56, 7), the yarn tension regulating module (25, 53) being a yarn tension. A yarn processing machine installed to derive a control value from the yarn tension measured by the sensor (54) and to keep the yarn tension constant in a predetermined yarn tension range.   The multifilament yarn production device (42) is preferably arranged in order in the yarn path, a yarn feed roll (48), a heater (43) and a cooler (44) arranged downstream thereof, and these A yarn processing machine according to claim 5, characterized in that it comprises an air textured nozzle or preferably a false twist spindle (45) arranged downstream of the nozzle.   The multifilament yarn manufacturing apparatus includes an air covering nozzle (5), and preferably a yarn supply roll (7) and / or at least one yarn guide in the yarn path (1) before the air covering nozzle (5). A device (22, 32) is disposed, and a yarn supply container (24, 30) is installed in the control yarn path (1), and the yarn supply contained in the yarn supply container (24, 30). The yarn processing machine according to claim 5 and / or 6, wherein the high elastic yarn is fed upward from the spool (20, 29).

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